For which war was the ammunition plant, located in Illinois, and now a tallgrass prairie reserve; the largest conservation site in the Chicago Wilderness region, originally opened?
World War II
-1
Section::::Abstract.
Midewin National Tallgrass Prairie
2146828
-1
Section::::Abstract.
Midewin National Tallgrass Prairie
2146828
-1
Section::::Abstract.
Joliet Army Ammunition Plant
7642113
-1
Section::::Abstract.
Joliet Army Ammunition Plant
7642113